iPad mini officially went on sale at 8 a.m. this morning and reports are already starting to flow in that many Apple Stores have sold out of initial stock. Topeka Capital’s Brian White released a note to clients this morning (via BusinessInsider) that noted all models of iPad mini sold out in just over two hours at Apple’s flagship Fifth Avenue New York City store. Before today’s launch, shipment dates for Apple’s online pre-orders of the device had been pushed back, while shipment dates for pre-ordered LTE models of the device were recently removed.

Now reports indicate stores in the United Kingdom, Singapore, Canada, and many other states from Alabama to Hawaii have sold out of initial supplies.

@markgurman better do it now. We are all out of whites. We only got like a 100 minis and 900 retinas.

It’s unclear just how much stock Apple had delivered to its various stores and resellers, but we noted earlier today that lines were much smaller than usual at many locations. The lines were most likely due to the fact today’s launch included just the Wi-Fi-only model, but it looks like Apple is still not able to meet demand in many locations. Some stores were rumored to get about 100 units, as noted in the tweet above, while we heard bigger stores received as many as 300.

Judging by the collection of tweets that we put together below, Apple is quickly selling out of initial iPad mini stock in many locations around the globe. Most stores are not expecting additional shipments today: